[. . . ] [. . . ] SERVICE AND REPAIR MANUAL 4 STROKE ENGINE PDF processed with CutePDF evaluation edition www. CutePDF. com JL50QT-18 JL50QT-X1/8 JL50QT-14 7 3 IDLING SPEED ADJUSTMENT SCREW AIR INLET TUBE 2 3 AIR SCREW IN, EX: (30mm) 60· IN, EX: (32mm) 32· IN: (24. 5mm) EX: (27. 5mm) 45· CORSE SURFACE VALVE SEAT SURFACE WIDTH 32· VALVE SEAT SURFACE WIDTH 60· [. . . ] [. . . ]